I've seen this once in a while in previous versions of Xcode 11 Beta, but once upgrading to Beta 7, these errors have become consistent.
Anyone know what this is and how to fix it?
<unknown>:0: error: imported declaration 'NSReadAccessURLDocumentOption' could not be mapped to 'NSAttributedStringDocumentReadingOptionKey.readAccessURL'
<unknown>:0: error: imported declaration 'NSAttributedStringCompletionHandler' could not be mapped to 'NSAttributedString.CompletionHandler'